ISO performance lags behind the Fujifilm, even though both have a large APS-C sized sensor. You can shoot up to ISO 1600 with confidence, at ISO 3200 there is minimal image noise but noticeable detail loss. In contrast, the Olympus, while losing detail, soothes over the appearance of noise with more skill. Colors look a tad muted, and exposure a tad underexposed.
Colors are rendered a tad flat.
The A5000 can shoot up to ISO 1600 in low-light with minimal noise.